Why am I so cranky in the morning? How effective is multitasking? When do I make the best decisions? Journalist Horstman reveals the answers to these questions and a lot more. She reviews a full day of brainwork by accounting for the mental processes of everyday activities, arranged by hour, beginning with 5 a.m. and "coming to consciousness." Horstman shows how, as hormone and neurotransmitter levels change throughout the day, there may be an optimal time for everything.